Compression Plugs | McMaster-Carr

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240 Products

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

Compression Fittings for Stainless Steel Tubing

A single sleeve (ferrule) bites into tubing as you tighten the nut, creating a strong seal. The nut and sleeve are included.

Precision Compression Fittings
for Stainless Steel Tubing

Luer Lock Couplings for Stainless Steel Tubing

Quickly connect low-pressure stainless steel lines with these couplings. Made of 316 stainless steel, they have excellent corrosion resistance.

Compression Fittings for Steel Tubing

A single sleeve (ferrule) bites into tubing as you tighten the nut, creating a strong seal.

High-Pressure Compression Fittings for Steel Tubing

Thicker walls make these fittings—sometimes called flareless or bite fittings—withstand about twice as much pressure as standard compression fittings, so they’re good for hydraulic power applications.

Precision Compression Fittings for Copper Tubing

Also known as instrumentation fittings, these are made to tighter tolerances than standard compression fittings. They are compatible with Parker CPI fittings.

Tube Fittings for Plastic and Rubber Tubing

Plastic Quick-Disconnect Tube
Couplings for Air and Water

Lighter in weight than their metal counterparts, these quick-disconnect couplings are made of acetal plastic. They are moisture resistant, so they won’t absorb water and lose strength, even in high-humidity environments.

Brass Quick-Disconnect Tube Couplings for Air

Made of brass, these couplings are more durable than plastic couplings.

High-Pressure Quick-Disconnect
Tube Couplings for Air

Not only are these chrome-plated brass couplings corrosion resistant, they’re also durable enough to handle pressures up to 250 psi and can be used with vacuum.

Brass Compression Tube Fittings for Air and Water

A single sleeve (ferrule) compresses the tubing as you tighten the nut on these fittings, creating a strong seal. They are brass for good corrosion resistance.

Quick-Disconnect Tube
Couplings for Food and Beverage

These quick-disconnect couplings meet NSF/ANSI 169 for food equipment.

Quick-Disconnect Couplings
for Plastic Tubing—Gasoline

Quick-disconnect couplings consist of a plug and a socket that join with a latch so you can easily connect and disconnect your line. Use in applications up to 150 psi.

Drain Valves

Also known as stop cocks, install these valves on your tank for easy draining of air or fluid.

Grease Fittings

Grease Fitting Manifolds

Save time by sending grease from one fitting to multiple points. These manifolds come with everything you need to set up a remote lubrication system.

Grease Fitting Junction Blocks

Choose these blocks if you need to lubricate multiple points but need to control how each is greased. Unlike grease fitting manifolds, these blocks have multiple fittings, so you control what each point receives and when.